Pacific International Pvt Ltd Bangalore deals with Graphite Electrodes to supply in Indian Steel plants. It is imported from China.

1. PACIFIC INTERNATIONAL PVT.
LTD Adding value to process flow
Pacific International Pvt . Ltd., based in India. We are operating in the field of molten
metal applications like Iron and Steel Industries. Since from last 25 years.
We have catered to several organizations in the past and have had a good working relation
with all of them, with no complaints from our clients. As a company we offer you services
that are of the highest standard and at extremely competitive rates.
Our mission is to satisfy our esteemed customers are unlimited. Our customer's needs
inspire and motivate us to meet their demands and push us to maintain high working and
services standards. We respond with innovative, value-added products and services that
improve our customer's quality, productivity, costs, environmental protection and
working conditions.

2. GRAPHITE ELECTRODES
FOR SECONDARY STEEL MAKING PROCESS
Product presentation

3. About us for Graphite Electrode
Pacific International Pvt . Ltd. Our company is recommended by our happy customers
on supply of modern technology Graphite Electrode products to provide the best
graphite electrodes at competitive prices as expected by our customers. Our company
will promote the advanced equipment and complete detection concept of
"environmental protection".
We supply Graphite Electrode and related products.
We focus on Quality, Equality and Stability.
Our Graphite Electrodes are ranks from 200 to 700mm at RP/HP/UHP Grades.
We are dedicated to Environmental Protection Standard.
We are always closely working with all our customers and other partners and try to
deliver satisfying product and service to you.

4. GRAPHITE ELECTRODES
Manufacturing Process

5.  RAW MATERIALS : Needle Coke (Approximately 85 – 90% in content).
The highly anisotropic needle coke, due to its structure is indispensable for the manufacture of
high-performance electrodes used in Electric Arc Furnace & Laddle Refinery Furnace.
BINDERS : (Approximately 20 – 25% in content).
Binding agents are used to agglomerate the solid particles to each other.
 MIXING & EXTRUSION :
The milled coke is mixed with coal tar pitch and some additives to form a uniform paste. Where
the mixture is extruded to form an electrode of the desired diameter & length.
 BAKING :
Here the extrude rods are placed in cylindrical stainless steel conisters to aviod the deformation
of electrode during the heating process.
Manufacturing Process

6.  IMPREGNATION :
The baked electrodes are impregnated with a special pitch at 200° C to give them the higher
density, mechanical strength and electrical conductivity.
 RE-BAKING :
A second baking or “re-bake” is required to carbonize the pitch impregnation and to drive off
any remaining volatiles.
 GRAPHITIZATION :
The final step in graphite electrode manufacture is a conversion of backed carbon to graphite is
called graphitizing.
The electrode are packed in electrical furnace surrounded by carbon particles to form a solid
mass. An electric current is passed through the furnace raising the temperature to approximately
3000° C.
 MACHINING:
The Graphite electrodes after cooling are machined to extract dimension & tolerances.

7. Graphite Electrode Overview
A graphite electrode is defined as a high level of electrical conductivity and the capability to
sustain in extremely high level of dissipated heat.
Graphite electrode can be classified as Ultra-high Power(UHP), High Power(HP), Regular
Power(RP).
By application, it’s usually defined as Electric Arc Furnace(EAF), Ladle Furnace(LF).

8. Graphite Electrode category
The graphite electrode are utilized in refine steel in Electric Arc Furnace, Ladle Refining Furnace,
as well as it can be useful in smelting processes.
In general, Graphite electrodes are also in three different consumption categories such as :
• Regular Power (RP) : 3.8 to 4.0 kg / MT
• High Power (HP) : HP 2.0-3.0 kg/ MT
• Ultra High Power (UHP) : UHP 0.8-1.0 Kg / MT

9. Major Application
 Electric Arc Furnace (EAF):
Steel mills UHP usually 350mm and large.
Iron & Steel foundries HP and UHP usually 400mm and smaller.
 Ladle Heating / Refining Furnace (LHF / LRF):
Steel mills UHP usually 400 and 450 mm
Steel mills HP usually 200 to 400 mm
 Types of Furnace :
1. Alternating current (AC) three phase
a) Up to 700mm electrodes
b) Uses three electrodes in a delta configuration.
2. Direct current (DC) single phase
a) Usually, 600 to 800mm electrode.
b) Uses one electrode in center.

10. Testing of Electrodes
Testing of Electrodes
1. Tests performed on finished graphite electrodes.
 On whole electrodes
 Specific electrical resistance
 Apparent density
 Machining tolerances
2. On core samples from selected electrodes
 Specific electrical resistance
 Apparent density
 Coefficient of thermal expansion
 Flexural strength (4-point loading)
 Ash

11. Properties of Electrodes
 Bulk or Apparent Density – A higher bulk density will generally be reflected in
improved mechanical properties.
 Flexural Strength – Higher flexural strength in electrodes will generally result in
lower electrode breakage frequency.
 Tensile Strength – Higher tensile strength in nipples will generally result in
lower nipple breakage frequency.
 Coefficient of Thermal Expansion (CTE) – Lower CTE will generally give
better resistance to thermal shock. Also, CTE compatibility between the graphite
electrode and connecting nipple is important for satisfactory performance of the
electrode joint.
 Specific Electrical Resistance (SER or ER) – Low specific resistance of
graphite electrodes allows maximum current carrying capability without
overheating of the electrode column.

12. Choosing right Electrode
So many choices – how do we determine the right one?
 Current density
 Secondary amperes/πr2 = current density
 Usually expressed in amps/cm2 or amps/in2
 Application – EAF, LF, other
 Time factor – tap-to-tap, on power
 Heat size, esp. in ladle
 Other possible factors
 Airflow characteristics
 Slag practices
 Chemistry of heat

13. Causes for Breakage
 Poor scrap quality
 Large pieces cause cave-ins
 Non-conductors are in the way of arcing.
 Improper regulator operation. Airflow characteristics
 Slow reaction to short circuit-can’t move away from cave-in.
 Improper addition – look for gaps or hot joint, may be unwinding.
 Debris or damage from storage or lift plug may contribute.
 Low strength or flaw in nipple – common with non – needle coke electrodes
 Operator error – furnace lid in way, dropped when slipping, etc.
 Socket and nipple to be dust free
 Tight fitting
 Torque for different sizes. N/mm2

14. Normal Diameter and length of Electrode.
Nominal Diameter Actual Diameter Nominal Length
mm inch Max Min Rough Spot mm
200 8 205 200 198 1800
250 10 256 251 247 1800
300 12 307 302 299 1800/2000
350 14 357 352 349 1800/2000
400 16 409 403 400 1800/2000
450 18 460 454 451 2100/2400
500 20 511 505 502 2100/2400
550 22 562 556 553 2100/2400
600 24 613 607 604 2400/2700
650 26 663 657 654 2400/2700
700 28 714 708 704 2500/2700
Our Specification and Capacity

15. Diameter Length Diameter(mm) Socket Depth
200 122T4N 122.24 177.8 115.92 94.9
250 152T4N 152.4 190.5 146.08 101.3
300 177T4N 177.8 215.9 171.48 114
350 203T4N 203.2 254 196.88 133
400 222T4N 222.25 304.8 215.93 158.4
400 222T4L 222.25 355.6 215.93 183.8
450 241T4N 241.3 304.8 234.98 158.4
450 241T4L 241.3 355.6 234.98 183.8
500 269T4N 269.88 355.6 263.56 183.8
500 269T4L 269.88 457.2 263.56 234.6
550 298T4N 298.45 355.6 292.13 183.8
550 298T4L 298.45 457.2 292.13 234.6
600 317T4N 317.5 355.6 311.18 183.8
600 317T4L 317.5 457.2 311.18 234.6
650 355T4N 355.6 457.2 349.28 234.6
650 355T4L 355.6 558.8 349.28 285.4
700 374T4N 374.65 457.2 368.33 234.6
700 374T4L 374.65 558.8 368.33 285.4
Socket and Nipple Dimensions
mm
Normal
Diameter(mm)
Nipple Socket

16. Dimensions of threads and sockets of taper nipples
Type
Diameter of
electrode
(mm)
Sizes of nipples(mm) Sizes of socket(mm)
Thread
pitch
(mm)
mm Inch D L d2 E d1 H
3TPI
250 10 155.57
0
-0.3
220.00
0
-1
103.80
0
-5
＜
10
147.14
+0.3
0
116.00
+7
0
8.47
300 12 177.16 270.90 116.90 168.73 141.50
350 14 215.90 304.80 150.00 207.47 158.40
400 16 215.90 304.80 150.00 207.47 158.40
400 16 241.30 338.70 169.80 232.87 175.30
450 18 241.30 338.70 169.80 232.87 175.30
450 18 273.05 355.60 198.70 264.62 183.80
500 20 273.05 355.60 198.70 264.62 183.80
500 20 298.45 372.60 221.30 290.02 192.20
550 22 298.45 372.60 221.30 290.02 192.20
4TPI
200 8 122.24
0
-0.3
177.80
0
-1
80.00
0
-5
＜7
115.92
+0.3
0
94.90
+7
0
6.35
250 10 152.40 190.50 108.00 146.08 101.30
300 12 177.80 215.90 129.20 171.48 114.00
350 14 203.20 254.00 148.20 196.88 133.00
400 16 222.25 304.80 158.80 215.93 158.40
450 18 241.30 304.80 177.90 234.98 158.40
500 20 269.88 355.60 198.00 263.56 183.80
550 22 298.45 355.60 226.58 292.13 183.80
600 24 317.50 355.60 245.63 311.18 183.80
4TPIL
300 12 177.80
0
-0.3
254.00
0
-1
122.87
0
-5
＜7
171.48
+0.3
0
133.00
+7
0
6.35
350 14 203.20 304.80 139.80 196.88 158.40
400 16 222.25 355.60 150.00 215.93 183.80
450 18 241.30 355.60 169.42 234.98 183.80
500 20 269.88 457.20 181.08 263.56 234.60
550 22 298.45 457.20 209.65 292.13 234.60
600 24 317.50 457.20 228.70 311.18 234.60

17. Thread detail

18. Why are graphite electrodes used?
Graphite Electrode/rods are used as in electrolysis because graphite’s structure enables it to be an excellent conductor. The high number of
delocalized electrons allows electricity to pass through graphite rapidly.
Is graphite electrode inert?
Graphite and platinum are examples of inert electrodes. Examples of reactive electrodes are copper, silver and gold.
What is the application of UHP Graphite Electrode?
UHP graphite electrodes are used to recycle steel in the arc furnace industry. Its main ingredient is high-value needle coke, made from petroleum or
coal tar. To meet the requirements of higher work efficiency and lower total cost, large capacity ultra-high power arc furnace is becoming more and
more popular. As a result, UHP graphite electrodes with diameters of more than 450 mm will dominate the market.
What are the main properties of graphite electrodes?
Different grades, different performance.
Mainly depends on the power, is the ordinary RP, high HP, or ultra-high.
The UHP. Specifically, it will involve density, ash content, resistivity, and bending resistance,
Strength, modulus of elasticity, etc.
What is Regular power graphite electrode?
Regular power graphite electrode is produced by ordinary grade petroleum coke, with low graphitization temperature, high resistivity, large linear
expansion coefficient and poor thermal shock resistance, so the allowable current density is low.

19. We establish a reasonable industrial link and a free marketing channel. The
product is sold in domestics and overseas, which exported to the United
States, Canada, Brazil, India, Mexico, Germany, Italy, Switzerland, Russia,
Japan, South Korea and other counties and regions.
The faith of our company is "Honesty, Harmony, win-win". Our company puts
scientific and contemporary management into effect and optimizes allocation of
resources of production processes. We take the "client first, quality first, honesty
firs, punctual delivery" as main principle, and do our best to offer perfect service.
Our Customers.

20. Thanks for your considering us as your supplier for Graphite Electrode.
Contact Us for your Requirement
When Inquiring, Please kindly inform us your detailed EAF/LF Condition, especially regarding to the
Transformer Capacity, Scrap used, Secondary Current and Electrode Specification in present Using.